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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid In Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2018     34,387,919        
Beginning balance at Dec. 31, 2018 $ 1,108,941   $ 342 $ 528,380 $ 584,494   $ (4,275)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 142,943       142,943    
Other comprehensive income, net of tax 7,234           7,234
Stock-based compensation expense 7,684     7,684      
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares)     26,784        
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 332     332      
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)     (15,127)        
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes 0   $ 1 (1)      
Time based stock awards granted (in shares)     17,655        
Issuance of common stock related to employee stock purchase plan (in shares)     16,129        
Issuance of common stock related to employee stock purchase plan 782     782      
Cash dividends declared (22,332)       (22,332)    
Ending balance (in shares) at Dec. 31, 2019     33,241,496        
Ending balance at Dec. 31, 2019 $ 1,190,681 $ (10,931) $ 331 482,286 705,105 $ (10,931) 2,959
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Standards Update [Extensible List] Accounting Standards Update 2016-13 [Member]            
Net Income $ 132,217       132,217    
Other comprehensive income, net of tax 12,541           12,541
Stock-based compensation expense 5,324     5,324      
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares)     3,300        
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 63     63      
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)     (28,811)        
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (1)     (1)      
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares)     4,126        
Time based stock awards granted (in shares)     176,252        
Issuance of common stock related to employee stock purchase plan (in shares)     24,210        
Issuance of common stock related to employee stock purchase plan 760     760      
Cash dividends declared (28,330)       (28,330)    
Common stock repurchased (in shares)     (1,640,910)        
Common stock repurchased $ (61,432)   $ (16) (61,416)      
Ending balance (in shares) at Dec. 31, 2020 31,779,663   31,779,663        
Ending balance at Dec. 31, 2020 $ 1,240,892   $ 315 427,016 798,061   15,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 176,691       176,691    
Other comprehensive income, net of tax (29,742)           (29,742)
Stock-based compensation expense 7,811     7,811      
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)     (24,429)        
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes 0   $ 1 (1)      
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares)     15,686        
Time based stock awards granted (in shares)     179,624        
Issuance of common stock related to employee stock purchase plan (in shares)     12,723        
Issuance of common stock related to employee stock purchase plan 496     496      
Cash dividends declared (44,691)       (44,691)    
Common stock repurchased (in shares)     (13,175)        
Common stock repurchased $ (682)   $ 0 (682)      
Ending balance (in shares) at Dec. 31, 2021 31,950,092   31,950,092        
Ending balance at Dec. 31, 2021 $ 1,350,775   $ 316 $ 434,640 $ 930,061   $ (14,242)